Halley station_level_pressure
2001   987.2   989.1       -   979.5   990.3   982.2   984.9   976.7   979.5   971.5       -       -
2002       -   979.3   988.3       -       -       -       -   979.3   984.4   988.6       -   982.2
2003       -   987.5       -   979.5   981.9       -   984.6       -       -   983.6       -   991.4
2004       -       -       -       -       -       -       -       -       -       -       -       -
2005       -       -   984.1   978.8   987.0   991.1   984.8   981.8   985.1   983.0   985.8   995.6
2006       -   986.4   983.2   983.0       -   985.9   979.4   987.3   984.3   977.7   978.8   985.6
2007   987.3       -   985.1   991.7       -       -   994.2   983.2   989.7   981.6   984.1   978.3
2008   984.0   981.4   982.8   986.4   987.1   984.3   980.6   978.9   985.6   977.0   978.6   977.1
2009   981.4       -       -       -       -       -       -       -       -       -       -       -